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**abilitiesz** Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis.

y=20x–5x^2

y=0

about the y-axis.

How I started the problem was I solved the first equation and got [0,4]. And then I used these numbers and plugged it into the shell method.

The equation that I used for the shell method was the first one equation that I listed.

My answer was 853.33pi.

But, it's incorrect. Can someone show me how to setup and solve the problem?